DE1961562B2 - Process for the preparation of a flushing bath which is connected between a hydrochloric acid pickling bath and a fluid bath containing ammonium chloride - Google Patents
Process for the preparation of a flushing bath which is connected between a hydrochloric acid pickling bath and a fluid bath containing ammonium chlorideInfo
- Publication number
- DE1961562B2 DE1961562B2 DE1961562A DE1961562A DE1961562B2 DE 1961562 B2 DE1961562 B2 DE 1961562B2 DE 1961562 A DE1961562 A DE 1961562A DE 1961562 A DE1961562 A DE 1961562A DE 1961562 B2 DE1961562 B2 DE 1961562B2
- Authority
- DE
- Germany
- Prior art keywords
- bath
- rinsing
- hydrochloric acid
- ammonium chloride
- fresh water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims description 20
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 title claims description 16
- 238000005554 pickling Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 10
- 235000019270 ammonium chloride Nutrition 0.000 title claims description 8
- 238000011010 flushing procedure Methods 0.000 title description 3
- 238000002360 preparation method Methods 0.000 title description 2
- 239000012530 fluid Substances 0.000 title 1
- 230000004907 flux Effects 0.000 claims description 13
- 239000013505 freshwater Substances 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 238000005246 galvanizing Methods 0.000 claims description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 4
- 239000001099 ammonium carbonate Substances 0.000 claims description 4
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 4
- 235000014413 iron hydroxide Nutrition 0.000 claims description 3
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims 2
- 238000005259 measurement Methods 0.000 claims 1
- 238000012958 reprocessing Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000008237 rinsing water Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000017517 Tephrosia purpurea Nutrition 0.000 description 1
- 240000004429 Tephrosia purpurea Species 0.000 description 1
- 150000003868 ammonium compounds Chemical class 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Coating With Molten Metal (AREA)
Description
3535
Die Erfindung betrifft ein Verfahren zur Aufbereitung eines Spülbades, das zwischen ein salzsaures Beizbad und ein Ammoniumchlorid enthaltendes Flußmittelbad geschaltet ist, in Feuerverzinkereien und Feuerverzinnereien, durch Neutralisation der aus dem Beizbad ausgeschleppten Salzsäure, sowie unter Frischwasserzufuhr. The invention relates to a method for the preparation of a rinsing bath between a hydrochloric acid pickling bath and a flux bath containing ammonium chloride is switched, in hot-dip galvanizing and hot-dip tinning, through neutralization of the pickling bath dragged out hydrochloric acid, as well as with fresh water supply.
In der Neuzeit ist es, insbesondere in den Ballungsgebieten der Industrie, zu einem sich ständig steigernden Bedarf an Brauchwasser für die verschiedensten Zwecke gekommen, was zu einer Intensivierung der Wassergewinnung in diesen Gebieten geführt hat Der hiermit verbundene erhöhte Aufwand für die Gewinnung des erforderlichen Brauchwassers für Industrie- so zwecke hat zwangsweise eine erhebliche Verteuerung für das Wasseraufkommen zur Folge.In modern times, especially in metropolitan areas of industry, it has become an ever increasing one Demand for domestic water for various purposes has come, leading to an intensification of the Water extraction in these areas has led to the associated increased effort for extraction the necessary process water for industrial purposes has inevitably a considerable increase in price for the water volume.
In den Anlagen zum Herstellen von metallischen Oberzügen auf eisernen Teilen, z. B. in Feuerverzinkerund Verzinnereien, werden die Güter vor dem Eintauchen in Metallschmelze mit HCI gebeizt, zum Entfernen der anhaftenden Beizmittelreste mit Wasser gespült und anschließend in ein mit NI-UCi und ZnCb angesetztes Bad getaucht.In the systems for the production of metallic upper layers on iron parts, e.g. B. in hot-dip galvanizing Tinning mills, the goods are pickled with HCI before they are immersed in molten metal Removal of the adhering pickling agent residues, rinsed with water and then in a with NI-UCi and ZnCb attached bath submerged.
Die Spülwässer werden bei den konventionellen «> Anlagen vorwiegend mit NaOH oder Ca(OH)2 neutralisiert, geklärt und das Klarwasser in die Abwasserwege geleitet Für das Spülen der Ware wird notwendigerweise das teuere Frischwasser aus dem Netz verwendetIn the conventional «> systems, the rinsing water is mainly neutralized and clarified with NaOH or Ca (OH) 2 , and the clear water is discharged into the sewage system. The expensive fresh water from the network is necessarily used to rinse the goods
Die Abwasserbehandlung erfolgt mit bekannten Stand- und Durchlauf-Neutralisationsanlagen.The wastewater treatment is carried out with well-known standing and continuous neutralization systems.
Um nun die Kosten für die Spülwasserbehandlung in tragbaren Grenzen zu halten, werden in den betroffenen Betrieben zur Einsparung von teurem Frischwasser Wasserkreisläufe zur Anwendung gebrachtIn order to keep the costs of flushing water treatment within acceptable limits, the affected Operated to save expensive fresh water, water cycles were used
Diese Kreislaufführung von Spülwässern wird nach dem jetzigen Stand der Technik durch Ionenaustauschanlagen und die verschiedenen bekannten Regenerationsanlagen ermöglicht Die Erstellung: derartiger Anlagen erfordert aber einen erheblichen Investitionsaufwand. This circulation of rinsing water is carried out according to the current state of the art by means of ion exchange systems and the various known regeneration systems enables the creation of: such However, systems require a considerable investment.
Eine solche Kreislaufführung ist insbesondere durch die Veröffentlichung »Neue Hütte«, 1964, Hevt 5, Seiten 297 bis 304 bekanntgeworden. Dort werden verschiedene Neutralisationsmittel für diesen Zweck empfohlen, wobei allerdings Ammoniak und Ammonium-Karbonat als Neutralisationsmittel bewußt ausgespart werden, weil sie als starke Fischgifte nicht in Abwässer geleitet werden dürfen.Such a cycle has become known in particular through the publication "Neue Hütte", 1964, Hevt 5, pages 297 to 304. Various neutralizing agents are recommended there for this purpose, although ammonia and ammonium carbonate are deliberately left out as neutralizing agents because they are strong fish poisons and must not be discharged into sewage.
Auch in der Literaturstelle Sierp »Die gewerblichen und industriellen Abwässer« 1967, Seiten 555 bis 573 wird auf die Giftigkeit von Ammoniumverbindungen hingewiesen. Keine der vorgenannten Literaturstellen hat ein brauchbares, wirtschaftliches Verfahren offenbart um ein mit Säure aus dem Beizbad verunreinigtes Spülbad aufzubereiten, also insbesondere die in das Spülbad eingeschleppte Säure, aber auch die Metallsalze, daraus zu entfernen.Also in the reference Sierp "The commercial and industrial wastewater" 1967, pages 555 to 573 Attention is drawn to the toxicity of ammonium compounds. None of the aforementioned references has disclosed a useful, economical process to remove one contaminated with acid from the pickling bath Prepare the rinsing bath, in particular the acid carried into the rinsing bath, but also the metal salts, to remove from it.
Es ist ferner durch die DE-AS 11 68 737 bekanntgeworden, eine Verunreinigung von Abwässern dadurch überhaupt zu verlöten, daß das Spülwasser im Kreislauf geführt wird, ohne daß dabei Substanzen zugegeben oder entferni werden. Dieses Verfahren hat den Nachteil, daß das Spülbad nicht gereinigt, sondern während des Betriebes zunehmend durch gelöste Eisensalze verunreinigt wird, die durch das Beizgut eingebracht bzw. erzeugt werden. Bei diesem Verfahren ist auch kein Flußmittelbad vorgesehen, so daß in diesem Fall das Problem einer Verarmung an Ammoniumchlorid bzw. Ergänzung des Flußmittelbades nicht auftreten kann. Schließlich wird bei dem Verfahren nach dieser Druckschrift die aus dem Beizbad herübergeschleppte Salzsäure nicht neutralisiertIt is also known from DE-AS 11 68 737, to solder a contamination of wastewater by the fact that the rinse water in the circuit is performed without adding or removing substances. This procedure has the Disadvantage that the rinsing bath is not cleaned, but increasingly dissolved during operation Iron salts that are introduced or generated by the pickling material are contaminated. In this procedure no flux bath is provided either, so that in this case there is a problem of depletion of ammonium chloride or supplementation of the flux bath cannot occur. Finally, according to the procedure of this publication does not neutralize the hydrochloric acid carried over from the pickling bath
Ausgehend von diesem Stande der Technik soll die Aufgabe gelöst werden, die Konzentration an Salzsäure und Eisen im .Spülbad konstant unterhalb eines niedrigen Wertes zu halten, so daß der pH-Wert des Spülbades nicht absinkt, eine hohe Wirtschaftlichkeit der Anlage zu erzielen und auf die Belange des Umweltschutzes Rücksicht zu nehmen.On the basis of this prior art, the object is to be achieved, the concentration of hydrochloric acid and iron in the .Spülbad to keep constant below a low value, so that the pH of the Rinsing bath does not sink, to achieve a high level of economic efficiency of the system and to meet the needs of the To take environmental protection into account.
Diese Aufgabe wird erfindungsgemaß dadurch gelöst, daß dem Spülbad Spülflüssigkeit unter Kreislaufführung entnommen, einem pH-Korrektionsbecken zugeführt und dort mit einer solchen Menge Ammoniak und Ammonium-Karbonat venetzt wird, daß der pH-Wert auf über 7, vorzugsweise auf 10 angehoben wird, dann einem Absetzbecken zugeführt wird, in dem Eisenhydroxid abgetrennt wird und dann in das Spülbad zurückgeführt wird, daß die Flüssigkeitsverluste des Spülbades durch Zugabe von Frischwasser ersetzt werden und daß ferner überschüssige, aufbereitete, mit Ammoniumchlorid angereicherte Spülflüssigkeit dem nachgeschalteten Flußmittelbad zugeleitet wird.This object is achieved according to the invention in that the rinsing bath is rinsing liquid with circulation taken, fed to a pH correction basin and there with such an amount of ammonia and Ammonium carbonate is wetted so that the pH value is raised to above 7, preferably to 10, then is fed to a settling basin, in which iron hydroxide is separated, and then into the rinsing bath is fed back that the liquid losses of the rinsing bath replaced by the addition of fresh water be and that also excess, processed, enriched with ammonium chloride rinsing liquid the downstream flux bath is fed.
Das Eisen kann dabei als Hydroxidschlamm entnommen werden. Andererseits werden die Verluste an Ammoniumchlorid, das aus dem Flußmittelbad in das Schmelzbad verschleppt wird, durch die Zufuhr von Ammoniak oder Ammonium-Karbonat und seine Verbindung mit der verschleppten Salzsäure laufend ersetzt Außerdem ergibt sich der Vorteil, daß die Spülflüssigkeit nicht verlorengeht, dem Spülbad laufendThe iron can be removed as hydroxide sludge. On the other hand, the losses are increasing Ammonium chloride, which is released from the flux bath into the The molten bath is carried away by the addition of ammonia or ammonium carbonate and its Compound with the entrained hydrochloric acid continuously replaced In addition, there is the advantage that the Rinsing liquid is not lost by running the rinsing bath
das eingeschleppte Eisen wieder entzogen wird und die Spülflüssigkeitsmenge*, bezogen auf die Masse der getauchten Teile, fast beliebig erhöht werden kann.the imported iron is withdrawn again and the Amount of flushing liquid *, based on the mass of the submerged parts, can be increased almost at will.
Durch diese Entnahme des unvermeidlicherweise in Lösung gehenden Eisens als kompakter Schlamm s einerseits und die Ergänzung der Verluste des Flußmittelbades andererseits wird eine in sich geschlossene, technisch und wirtschaftlich optimal arbeitende Anlage geschaffen.As a result of this removal of the iron, which inevitably goes into solution, as a compact sludge on the one hand and the addition of the losses of the flux bath on the other hand becomes a self-contained, technically and economically optimally working system created.
Die Erfindung wird nachstehend anhand der Zeichnung, die eine nach dem Verfahren arbeitende Anlage in schematischer Darstellung zeigt, näher erläutertThe invention is explained below with reference to the drawing, which shows a system operating according to the method in a schematic representation, explained in more detail
Irt dem Beizbad 1 wird das später zu verzinkende bzw. verzinnende Gut mit Salzsäure gebeizt, da die zu überziehende OberflEche der Gegenstände völlig metallrein, fettfrei und ölfrei sein muß. Hiernach wird das Gut nach dem Übeiführen in das Spülbad 2 zur Entfernung der ihm anhaftenden Beizmittelreste mittels des inr: Spülbad enthaltenen Spülwassers gespült Dann wird das Gut in das Flußmittelbad 3 gebracht, das mit Ammoniumchlorid und Zinkchlorid als Flußmitte! beschickt ist Anschließend erfolgt dann im Schmelzbad 4 das Feuerverzinken bzw. Verzinnen des G-ites.In the pickling bath 1, the later to be galvanized resp. Tinned items stained with hydrochloric acid, as the surface of the objects to be coated is completely must be metal-clean, grease-free and oil-free. After this, the material is used after being transferred into the rinsing bath 2 Removal of the pickling agent residues adhering to it by means of the rinsing water contained in the inr: rinsing bath, then rinsed the material is brought into the flux bath 3 with ammonium chloride and zinc chloride as the middle of the flux! is then charged The hot-dip galvanizing or tinning of the G-ite then takes place in the molten bath 4.
Das mit Beizmittel esten beladene Spülwasser läuft vom oberen Rand des Spüibades 2 über ein pH-Körrektionsbecken 5 in ein Absetzbecken 6, aus dem das geklärte Spülwasser wieder in dem Spülbad 2 zugeführt wird. In dem pH-Korrektionsbecken 5 werden die erforderlichen Chemikalien (Ammoniak, AmmanJum-Karbonat) von der Chemikaliendosierstation 7 dem Verbrauch entsprechend pH-mäßig gesteuert dem Spülwasser zugegeben. Das sich bildende Eisenhydroxid wird im Absetzbecken 6 abgesetzt Der abgesetzte Schlamtn wird kontinuierlich oder auch in gewissen Zeitabständen abgezogen und anschließend in einer Filtrieranlage 8 filtriert Das Filtrat wird in das Absetzbecken 6 zurückgeführtThe rinsing water laden with pickling agent runs from the upper edge of the rinsing bath 2 over a pH calibration basin 5 into a settling basin 6, from which the clarified rinsing water is fed back into the rinsing bath 2 will. In the pH correction basin 5, the required chemicals (ammonia, AmmanJum carbonate) controlled by the chemical metering station 7 according to the consumption according to pH Rinse water added. The iron hydroxide that forms is deposited in the sedimentation basin 6 Schlamtn is withdrawn continuously or at certain time intervals and then in one Filtration system 8 filtered The filtrate is returned to the settling tank 6
Das mit dem Schlamm aus der Filteranlage 8 abgehende Wasser wird durch in das Spülbad 2 i.r entsprechender Menge über eine |?rischwasserleitung 9 eingeleitetes Frischwasser ersetztThe water leaving the filter system 8 with the sludge is transferred to the rinsing bath 2 i.r A corresponding amount of fresh water introduced via a fresh water line 9 is replaced
Das auf diese Weise geklärte und behandelte Spülwasser, das überwiegend NH,,C1-Salz enthält, wird im Kreislauf geführt Das ist möglich, weil in diesem Spülwasser kein Natriumchlorid bzw. Calziumchlorid enthalten sind und folglich keine qualitätsmindernden Einwirkungen auf das Gut auftreten.The rinsing water clarified and treated in this way, which mainly contains NH ,, C1 salt, is circulated This is possible because there is no sodium chloride or calcium chloride in this rinse water are contained and consequently no quality-reducing effects on the goods occur.
Bei höheren Einschleppungen von Salzsäure in das Spülbad wird das Spülwasser se lange im Kreislauf geführt, bis seine N^Cl-Konzemxatkm so angewachsen ist, daß sie die Konzentration des Flußmittelbades 3 erreicht Damit dieser Wert konstant bleibt wird dann entsprechend Frischwasser zugesetztIf more hydrochloric acid is carried over into the rinsing bath, the rinsing water will be circulated for a long time led until its N ^ Cl concen-tration grew so much is that it reaches the concentration of the flux bath 3 so that this value remains constant then fresh water added accordingly
Die überschüssige, mit NH4CI angereicherte Wassermenge wird in einem Sammelbehälter 10 gespeichert und findet zum Ansetzen und zum Ergänzen des Flußmittelbades 3 Verwendung.The excess amount of water enriched with NH4CI is stored in a collecting container 10 and is used for preparing and supplementing the Flux bath 3 use.
Die Menge der erforderlichen Frischwasserzugabe erfolgt erfindungsgemäß durch Messung der NH4Cl-Konzeniration mittels einer Leitfähigkeitsmeßeinrichtung und Steuervorrichtung 11, die ein Regelventil 12 für die Frischwasserzufuhr über die Leitung 13 steuertAccording to the invention, the amount of fresh water required is added by measuring the NH 4 Cl concentration by means of a conductivity measuring device and control device 11 which controls a regulating valve 12 for the fresh water supply via line 13
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE754457D BE754457A (en) | 1969-12-09 | PROCESS FOR RECYCLING AND RECOVERING THE RINSING WATER OBTAINED AFTER THE PICKLING OF PARTS TO BE RETRACTED | |
| DE1961562A DE1961562C3 (en) | 1969-12-09 | 1969-12-09 | Process for the preparation of a rinsing bath which is connected between a hydrochloric acid pickling bath and a flux bath containing ammonium chloride |
| CH163070A CH538552A (en) | 1969-12-09 | 1970-02-05 | Process for recycling and recycling of the rinsing water that accumulates in plants for the production of metallic coatings, in particular with hot-dip galvanizing and tin-plating, after acid pickling of the parts to be coated |
| ZA703836A ZA703836B (en) | 1969-12-09 | 1970-06-05 | Method of circulating and utilisation of rinsing water from plant for producing metal coatings,for example,hot galvanising and hot tin plating after the pickling of the parts to be coated |
| YU2253/70A YU37293B (en) | 1969-12-09 | 1970-09-10 | Process for the purification of rinsing water obtained in hot zincing or tinning |
| FR7043886A FR2072986A5 (en) | 1969-12-09 | 1970-12-07 | |
| SE16517/70A SE362447B (en) | 1969-12-09 | 1970-12-07 | |
| GB5826770A GB1333229A (en) | 1969-12-09 | 1970-12-09 | Washing metal articles |
| NL7017989A NL167734C (en) | 1969-12-09 | 1970-12-09 | METHOD FOR APPLYING A METAL COATING TO ARTICLES BY IMMERSION IN A METAL BATH |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1961562A DE1961562C3 (en) | 1969-12-09 | 1969-12-09 | Process for the preparation of a rinsing bath which is connected between a hydrochloric acid pickling bath and a flux bath containing ammonium chloride |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE1961562A1 DE1961562A1 (en) | 1971-06-24 |
| DE1961562B2 true DE1961562B2 (en) | 1979-06-07 |
| DE1961562C3 DE1961562C3 (en) | 1985-04-25 |
Family
ID=5753315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1961562A Expired DE1961562C3 (en) | 1969-12-09 | 1969-12-09 | Process for the preparation of a rinsing bath which is connected between a hydrochloric acid pickling bath and a flux bath containing ammonium chloride |
Country Status (9)
| Country | Link |
|---|---|
| BE (1) | BE754457A (en) |
| CH (1) | CH538552A (en) |
| DE (1) | DE1961562C3 (en) |
| FR (1) | FR2072986A5 (en) |
| GB (1) | GB1333229A (en) |
| NL (1) | NL167734C (en) |
| SE (1) | SE362447B (en) |
| YU (1) | YU37293B (en) |
| ZA (1) | ZA703836B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2917597A1 (en) * | 1979-04-30 | 1980-11-13 | Siemens Ag | METHOD FOR REGENERATING AMMONIACAL ETCH SOLUTIONS FOR ETCHING METALLIC COPPER |
| DE3334571A1 (en) * | 1983-09-24 | 1985-06-27 | Peter 8351 Wallersdorf Hammang | Process for keeping the temperatures constant in flush basins of painting plants for motor vehicle bodies or parts |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1168737B (en) * | 1962-08-16 | 1964-04-23 | Mannesmann Ag | Process for preventing the occurrence of waste water when flushing pickled metal objects, in particular pickled thin sheets, before dry-galvanizing |
-
0
- BE BE754457D patent/BE754457A/en not_active IP Right Cessation
-
1969
- 1969-12-09 DE DE1961562A patent/DE1961562C3/en not_active Expired
-
1970
- 1970-02-05 CH CH163070A patent/CH538552A/en not_active IP Right Cessation
- 1970-06-05 ZA ZA703836A patent/ZA703836B/en unknown
- 1970-09-10 YU YU2253/70A patent/YU37293B/en unknown
- 1970-12-07 SE SE16517/70A patent/SE362447B/xx unknown
- 1970-12-07 FR FR7043886A patent/FR2072986A5/fr not_active Expired
- 1970-12-09 GB GB5826770A patent/GB1333229A/en not_active Expired
- 1970-12-09 NL NL7017989A patent/NL167734C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL167734C (en) | 1982-01-18 |
| GB1333229A (en) | 1973-10-10 |
| CH538552A (en) | 1973-06-30 |
| FR2072986A5 (en) | 1971-09-24 |
| YU37293B (en) | 1984-08-31 |
| ZA703836B (en) | 1971-01-27 |
| NL167734B (en) | 1981-08-17 |
| YU225370A (en) | 1983-04-27 |
| NL7017989A (en) | 1971-06-11 |
| BE754457A (en) | 1971-01-18 |
| DE1961562C3 (en) | 1985-04-25 |
| DE1961562A1 (en) | 1971-06-24 |
| SE362447B (en) | 1973-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8281 | Inventor (new situation) |
Free format text: BOEHM, ADOLF, DIPL.-CHEM., 5340 BAD HONNEF, DE |
|
| C3 | Grant after two publication steps (3rd publication) |